學習vaniglia源碼中的socket部分，主要針對其server側的代碼實現做個記錄。其代碼有兩部分值得學習，一塊是實現了一個經典的線程池，另外一個是利用代理接口擴展業務的具體socket消息處理。

socket的server主要由三個部分組成：

• ServerDelegate接口，提供readRequest、writeResult接口。由用戶擴展并注冊到SocketReceiver中；
• SocketReceiver類，socket server的工作線程；
• SocketServer類，初始化一個SocketReceiver的線程池，當accept返回時，喚醒空閑的SocketReceiver執行。

SocketServer核心代碼主要是兩個部分：

一是初始化線程池：

SocketReceiver[] receivers = new SocketReceiver[numOfThreads];for (int i = 0; i < numOfThreads; i++) {ServerDelegate delegate = null;try {delegate = (ServerDelegate)serverDelegateClass.newInstance();} catch (InstantiationException e) { //略}SocketReceiver receiver = SocketReceiver.createSocketReceiver(delegate);//該函數中SocketReceiver線程被startreceiversPool.addElement(receiver);//receiversPool是一個vector變量；receivers[i] = receiver;}

二是在accept返回時選擇ready的線程執行，如下：

SocketReceiver receiver = (SocketReceiver)receiversPool.get(receiverIndex);//receiverIndex是外側循環的變量receiverIndex = (receiverIndex + 1) % receiversPoolSize;//通過index遍歷vectorif (receiver.isReady()) {handling = true;if (clientSocketSoTimeout > 0) {logger.debug("Setting client socket SoTimeout to "+clientSocketSoTimeout+"ms");try {clientSocket.setSoTimeout(clientSocketSoTimeout);} catch (SocketException e) {logger.error("Exception while setting SoTimeout for client socket", e);}}clientSocket.setTcpNoDelay(true);receiver.handle(clientSocket);//一個工作線程被喚醒}

SocketReceiver的核心代碼是典型的工作線程，我將它簡化成一個框架版本，如下：

public class Receive implements Runnable {private boolean ready; Receive(){ready = true;}static Receive start(){Receive rev = new Receive();Thread t = new Thread(rev);t.start();return rev;}@Overridepublic void run() {while(true){synchronized(this){while(true == ready){//當handler沒有調用時該線程wait中。try {wait();} catch (InterruptedException e) { e.printStackTrace();}}}System.out.println("Receive run, service handler");//這部分的代碼在在socket里就是處理input和output，實現時調用業務的代理接口。 ready = true;synchronized(this) {notify();}}}public synchronized void handler(){//有業務出發時，handler被調用while(ready == false){try {wait();} catch (InterruptedException e) { e.printStackTrace();}}ready = false;notify();} }

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轉載于:https://www.cnblogs.com/Fredric-2013/archive/2013/04/06/3002951.html

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